Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...720.1738p&link_type=abstract
The Astrophysical Journal, Volume 720, Issue 2, pp. 1738-1751 (2010).
Astronomy and Astrophysics
Astronomy
15
Galaxies: Abundances, Galaxies: Evolution, Galaxies: Ism, H Ii Regions
Scientific paper
New improved empirical calibrations for the determination of electron temperatures and oxygen and nitrogen abundances in H II regions from the strong emission lines of oxygen, nitrogen, and sulfur are given. They are derived using spectra of H II regions with measured electron temperatures as calibrating data. Calibration relations are given separately for three classes of H II regions: cool, warm, and hot ones. Criteria for assigning a H II region to one of these classes are suggested. We find that classification ambiguities arise only in the case of hot H II regions with enhanced nitrogen abundances. The derived calibrations provide reliable abundances for H II regions: the mean difference between oxygen abundances determined from the calibrations and Te -based oxygen abundances is ~0.075 dex, while it is ~0.05 dex for nitrogen abundances.
Pilyugin Leonid S.
Thuan Trinh Xuan
Vilchez José M.
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